Two vectors have magnitudes and and act at an angle of to each other

MATHEMATICS · Single correct · A Level · Mathematics · Vectors · Vectors

Problem

Two vectors have magnitudes

5\,\text{units}

and

12\,\text{units}

and act at an angle of

60^{\circ}

to each other. What is the magnitude of their resultant? (a)

16.5\,\text{units}

(b)

15.1\,\text{units}

(c)

13\,\text{units}

(d)

14.1\,\text{units}